Merge pull request #1696 from segmentio/DOC-201_update-mixpanel-alias

DOC-201 added merge call [netlify-ignore]

Author: markzegarelli

src/connections/destinations/catalog/mixpanel/index.md

@@ -197,10 +197,15 @@ If you're not familiar with the Segment Specs, take a look to understand what th
 analytics.alias('newUserId')
 ```
 
-**Important:** Mixpanel used to require that you call `alias` in all libraries to connect anonymous visitors to identified users. However, with the release of Mixpanel's new [Identity Merge feature](https://help.mixpanel.com/hc/en-us/articles/360039133851#enable-id-merge) this is no longer necessary. To enable ID Merge, go to your Mixpanel Settings Dashboard, navigate to **Project Settings > Identity Merge** and enable the setting from that screen. If you are _not_ using this setting, use the instructions below.**
+> info ""
+> **Important:** Mixpanel used to require that you call `alias` in all libraries to connect anonymous visitors to identified users. However, with the release of Mixpanel's new [Identity Merge feature](https://help.mixpanel.com/hc/en-us/articles/360039133851#enable-id-merge) this is no longer necessary. To enable ID Merge, go to your Mixpanel Settings Dashboard, navigate to **Project Settings > Identity Merge** and enable the setting from that screen. If you are _not_ using this setting, use the instructions below.
 
 
-As soon as you have a `userId` for a visitor that was previously anonymous you'll need to [`alias`](/docs/connections/spec/alias/) their old anonymous `id` to the new `userId`. In Mixpanel only **one** anonymous user history can be merged to **one** identified user. For that reason you should only call `alias` once, right after a user registered, but before the first `identify`.
+As soon as you have a `userId` for a visitor that was previously anonymous you'll need to [`alias`](/docs/connections/spec/alias/) their old anonymous `id` to the new `userId`. In Mixpanel only **one** anonymous user history can be merged to **one** identified user. For that reason you should only call `alias` once, right after a user registered, but before the first `identify`. To merge identities in Mixpanel, send an identify call with both the previous anonymous ID, and the new user ID, as follows:
+
+```javascript
+analytics.alias('anonId','newUserId');
+```
 
 You'll also want to `track` the action that caused the user to be identified or created. Read our [guide on how to identify new users](/docs/connections/spec/best-practices-identify/) to learn why.